The phrase "areas did not differ" is correct and usable in written English.
It can be used in contexts where you are comparing different areas or groups and noting that there is no significant difference between them.
Example: "In the study, the results indicated that the areas did not differ in terms of average temperature."
Alternatives: "areas were similar" or "areas showed no difference."
The intra-abdominal subcutaneous fat areas were significantly larger in women than in men counterparts, whereas the visceral fat areas did not differ.
Maximum flushing occurred in summer, but leaf areas did not differ significantly with season.
Chen et al. [14] found that the PCF area in the cough headache patients was significantly smaller than controls while hindbrain areas did not differ.
However, with the exception of the left temporal pole for auditory words, activity in these fronto-temporal areas did not differ significantly between English and Spanish.
Parasite prevalence in the urban and transition areas did not differ significantly using both microscopy and PCR as diagnostic methods (p = 0.70).
The number of seed points that were used for tractography in each of the considered areas did not differ between controls and LHON patients.
Often, the affected areas do not differ much from the normal tissues in terms of vascular permeability, temperature, and local pH value.
Notably, although terminology for EC subdivisions in the rat emphasizes the lateral to medial axis, these areas do not differ solely with respect to their position in relation to the hippocampal formation and the rhinal fissure (Witter et al., 2000a).
The overall incidence of deforestation fires per area did not differ consistently among reserve types in different years.
Total horizontal vascular area did not differ among species (F3,17 = 2.189, P = 0.135), while differences did exist in total vertical vascular area (F3,19 = 4.00, P = 0.0265).
The data showed that the odds of causing advanced extent of lung disease by different MTBC lineages identified in this study area did not differ significantly (OR = 0.304, CI: 95 %; 0.039-2.326, P = 0.251) between MTBC lineages (Table 2).
